Forum Discussion
Shared Mailbox delegate - block delegate from sending emails
Scenario: 1 regular mailbox for user@contoso.com 1 shared mailbox shared@contoso.com user have send on behalf rights to shared mailbox shared@contoso.com requirement is to block user@c...
you can do it using third-party tools/services.
Have a look at SmartReply cloud service. It seems that "Uncoditional address rewriting rule" will fit your requirements.
If you run only Outlook for Windows, take a look at SetFrom add-in.